{"instruction": "You are an expert in named entity recognition. Please extract entities that match the schema definition from the input. Return an empty list if the entity type does not exist. Please respond in the format of a JSON string.", "schema": ["Chemical"], "input": "A new derivative of polyamidoamine and polyethylenimine , G2 . 5 - PEI 423 or G1 . 5 - PEI 423 , is prepared by an amidation reaction of PAMAM G2 . 5 or PAMAM G1 . 5 using PEI 423 ."}
{"Chemical": ["polyamidoamine", "polyethylenimine", "PEI 423", "PAMAM"]}